Tuning Anomalous Floquet Topological Bands with Ultracold Atoms

Jin-Yi Zhang; Chang-Rui Yi; Long Zhang; Rui-Heng Jiao; Kai-Ye Shi; Huan Yuan; Wei Zhang; Xiong-Jun Liu; Shuai Chen; Jian-Wei Pan

doi:10.1103/PhysRevLett.130.043201

Tuning Anomalous Floquet Topological Bands with Ultracold Atoms

Phys Rev Lett. 2023 Jan 27;130(4):043201. doi: 10.1103/PhysRevLett.130.043201.

Authors

Jin-Yi Zhang^{1

2

3}, Chang-Rui Yi^{1

2

3}, Long Zhang^{4

5

6}, Rui-Heng Jiao^{1

2

3}, Kai-Ye Shi⁷, Huan Yuan^{1

2

3}, Wei Zhang⁷, Xiong-Jun Liu^{4

5

8}, Shuai Chen^{1

2

3}, Jian-Wei Pan^{1

2

3}

Affiliations

¹ Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
² Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
³ Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China.
⁴ International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
⁵ Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
⁶ School of Physics and Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
⁷ Department of Physics, Renmin University of China, Beijing 100872, China.
⁸ Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.

PMID: 36763419
DOI: 10.1103/PhysRevLett.130.043201

Abstract

The Floquet engineering opens the way to create new topological states without counterparts in static systems. Here, we report the experimental realization and characterization of new anomalous topological states with high-precision Floquet engineering for ultracold atoms trapped in a shaking optical Raman lattice. The Floquet band topology is manipulated by tuning the driving-induced band crossings referred to as band inversion surfaces (BISs), whose configurations fully characterize the topology of the underlying states. We uncover various exotic anomalous topological states by measuring the configurations of BISs that correspond to the bulk Floquet topology. In particular, we identify an unprecedented anomalous Floquet valley-Hall state that possesses anomalous helical-like edge modes protected by valleys and a chiral state with high Chern number.